TITLE: Simple example of approximating a nonlinear system with Volterra series
QUESTION [8 upvotes]: I'm trying to understand Volterra series as a means of modelling/approximating nonlinear input-output relations. 
I'm having trouble to understand the abstract definitions of kernels/functionals and was looking for a simple example of a nonlinear system and its approximation via Volterra series. 
Any help appreciated :)

REPLY [3 votes]: Try these links:
https://web.stanford.edu/~boyd/papers/pdf/analytical_volterra.pdf
Videos (on youtube)
Lecture 14: Volterra Series, Dr. Wim van Drongelen, Modeling and Signal Analysis for Neuroscientists